Toxgard Ii Gas Monitor

SPECIFICATION

TOXGARD II GAS MONITOR

USER INSTRUCTIONS

FOR THE

TOXGARD II GAS MONITOR

The user must modify and customize the specification to make it functional. The following should be addressed:

1.Paragraph 1.2.1 - Fill in the total number of monitoring units necessary.

a.Copy and renumber section 2.1 for combustible monitors.

b.Copy and renumber section 2.2 for toxic and oxygen monitors.

2.Paragraph 1.2.2 - Fill in the required outputs of the monitoring unit selected in paragraph

1.2.1.

a.Copy and renumber section 4.1 for standard 4 to 20mA output.

b.Copy and renumber section 4.2 for isolated 4 to 20mA.

c.Copy and renumber section 4.3 for digital network output.

3.Paragraph 1.2.3 - Fill in the number of each mounting style of the monitoring unit

selected in paragraph 1.2.1.

a.Copy and renumber section 5.1 for side mount or bottom mount sensing of the

monitor.

b.Copy and renumber section 5.2 for remote sensor mounting of the monitor.

4.Paragraph 1.2.4 - Select one of four paragraphs and complete the number of gas sampling

systems for the monitors selected in paragraph 1.2.1.

a.Copy and renumber section 6.1 for DC pumped gas sampling systems.

b.Copy and renumber section 6.2 for air aspirated gas sampling systems.

c.Copy and renumber section 6.3 for airline monitor (CO only) gas sampling

systems.

d.Copy and renumber section 6.4 for ‘flow block only’ sampling systems.

5.Paragraph 1.2.5 - Enter the number of battery backups needed for the monitoring units

selected in paragraph 1.2.1

a. Copy and renumber section 7.0.

6.Paragraph 1.2.7 - Select and fill the number of automatic calibration systems for the

monitoring units selected in paragraph 1.2.1.

a.Copy and renumber section 8.1 for general purpose automatic calibration systems.

b.Copy and renumber section 8.2 for explosion proof automatic calibration systems.

REV 0

toxgrd1101/14/98

SPECIFICATION

TOXGARD II GAS SENSOR/TRANSMITTER

1.0Gas Monitor System Specification - Paragraphs 1.1 through 11.0 detail the specification

for the Gas Monitor System.

1.1General - The Gas Monitor System will measure and display a single gas concentration.

The system shall provide audio and visual alarms when preset limits are exceeded. Relay output for alarms shall be provided.

1.2Number of system monitor units will be as follows:

1.2.1The following table lists the total number of monitors required:

Range/FullNumber of

GasScale Monitors

Combustible Gas -

Natural Gas & H2 0-100% LEL______

Combustible Gas -

Petroleum vapors 0-100% LEL______

Combustible Gas -

Solvents 0-100% LEL______

Carbon Monoxide - (CO) 0-100 ppm______

Carbon Monoxide - (CO) 0-500 ppm______

Hydrogen Sulfide - (H2S) 0-10 ppm______

Hydrogen Sulfide - (H2S) 0-50 ppm______

Hydrogen Sulfide - (H2S) 0-100 ppm______

Chlorine Dioxide - (ClO2) 0-3 ppm______

Oxygen - (O2) 0-25%______

Nitric Oxide - (NO) 0-100 ppm______

Nitrogen Dioxide - (NO2) 0-10 ppm______

Sulfur Dioxide - (SO2) 0-25 ppm______

Chlorine - (Cl2) 0-5 ppm______

Hydrogen Cyanide - (HCN) 0-50 ppm______

Hydrogen Chloride - (HCl) 0-100 ppm______

1.2.2The following table breaks down the required output of the listed

sensor/transmitters:

GasOutputs

Non-IsolatedIsolatedDigital

4 to 20 mA4 to 20 mANetwork

(Standard)(Option)(Option)

Combustible Gas -

Natural Gas & H2______

Combustible Gas -

Petroleum vapors______

Combustible Gas -

Solvents______

Carbon Monoxide - (CO)______

Hydrogen Sulfide - (H2S)______

Chlorine Dioxide - (ClO2)______

Oxygen - (O2)______

Nitric Oxide - (NO)______

Nitrogen Dioxide - (NO2)______

Sulfur Dioxide - (SO2)______

Chlorine - (Cl2)______

Hydrogen Cyanide - (HCN)______

Hydrogen Chloride - (HCl)______

1.2.3The following table breaks down the required mounting style of the listed

monitors:

GasSensor Mounting Style

Side Bottom Remote Remote

MountedMounted Sensor Sensor

(Gen. Purp.)(Explos. Proof)

Combustible Gas -

Natural Gas & H2______

Combustible Gas -

Petroleum vapors______

Combustible Gas -

Solvents______

Carbon Monoxide - (CO)______

Hydrogen Sulfide - (H2S)______

Chlorine Dioxide - (ClO2)______

Oxygen - (O2)______

Nitric Oxide - (NO)______

Nitrogen Dioxide - (NO2)______

Sulfur Dioxide - (SO2)______

Chlorine - (Cl2)______

Hydrogen Cyanide - (HCN)______

Hydrogen Chloride - (HCl)______

1.2.4Number of optional Gas Sampling systems - The number of gas sampling systems for the

above monitors will be as follows:

1.2.4.1The following required number of gas sampling systems that contain a DC pump are: (NO). ______.

1.2.4.2The following required number of gas sampling systems that contain an air

aspirator pump are: (NO). ______.

1.2.4.3The following required number of gas sampling systems that contain a airline

monitoring system are: (NO). ______.

1.2.4.4The following required number of gas sampling systems that contain a flow

block only are: (NO) ______.

1.2.5Number of optional battery power backup - The number of battery backups for the above

monitors will be (NO). ______.

1.2.6Number of System Relays - The number of internal relays for the monitor will be as follows:

1.2.6.1One relay will be provided for each of the three alarm levels.

1.2.6.2One relay will be provided for system fault indication.

1.2.6.3One relay will be provided to engage horn functions.

1.2.7Number of optional automatic calibration systems - The number of automatic calibration

systems for the above monitors will be as follows:

1.2.7.1The following required number of general purpose automatic calibration systems are: (NO). ______.

1.2.7.2The following required number of explosion proof automatic calibration systems are: (NO). ______.

1.2.8Number of optional duct mounting installation hardware for remote sensors required -

The number of duct mounting installation hardware for the above monitors will be as follows:

1.2.8.1The following required number of duct mount kits are: (NO) ______.

2.0Gas Monitor Configuration - The gas monitor design shall conform to Paragraphs 2.0 through 11.0. Deviations are not acceptable.

2.0.1Description - The gas monitor system shall consist of a monitor/readout unit with an integral or remote gas sensor element.

2.0.2Gas Monitor Configuration - The gas monitor shall be enclosed in a wall mount type enclosure. It shall conform to Paragraphs 2.0.2.1 through 2.0.2.4.

2.0.2.1Enclosure Type - The enclosure shall be designed to meet a NEMA 4X rating. Access to the inside of the enclosure, monitor front panel and wiring connections shall be through a front facing, full length door. The door shall have a shatterproof window of sufficient size to allow the viewing of the meter and indicator lights.

2.0.2.2Enclosure Size - The enclosure shall be less than 12 inches in any dimension (mounting provisions excluded).

2.0.2.3Mounting Provisions - Mounting brackets for the purpose of attaching the unit to a flat surface shall be provided.

2.0.2.4External Controls - A switch accessible from the outside of the enclosure shall be provided for the purpose of alarm relay reset audible alarm silencing.

2.1Monitoring Sensor Element Requirements - Sensors used as part of the gas monitoring system specified in Paragraph 1.2.1 will be according to Paragraphs 2.1.1 through 2.1.2.

2.1.1Combustible Monitor Sensor - (Remote explosion-proof sensor mount only version available for combustible gases.)

2.1.1.1The combustible gas sensor will be the catalytic bead type. The sensor must have a demonstrated resistance to degradation by silicones and reduced sulfur gases (Hydrogen Sulfide).

2.1.1.2The interconnect wiring from the remote combustible sensor/transmitter to the monitoring unit will be a 3-wire cable which can extend up to 50 ft. between monitor and sensor.

2.1.1.3The combustible sensor/transmitter can detect an over-range condition. When this occurs it must be shown on the front panel display on the monitoring unit.

2.1.2Toxic and Oxygen Monitor Sensors

2.1.2.1The toxic gas monitor sensor will be the electrochemical type. The sensor will not require the periodic addition of reagents. The oxygen monitor sensor will be the electrochemical fuel cell type. The sensor will not require the periodic addition of reagents.

2.1.2.2The interconnect wiring for remote mounted versions of toxic gas or oxygen sensor/transmitter to the monitoring instrument will be a 2 or 3 wire cable.

3.0Monitor Unit Requirements

3.1Readout Displays - A four digit LED readout shall be provided for the purpose of displaying the gas concentration. The value displayed shall be a direct reading of the gas concentration specified in Paragraph 1.2.1. System status indicators will also be provided with the LED display.

3.2Alarm Set Point Levels - Three separate alarm set point levels shall be provided. The set points shall be independently adjustable for any value in the readout range. The set points shall provide drive signals to user interface relays. The alarm set points shall have the capability of providing the user a selection of latching or non-latching mode.

3.3Visual Alarm Indicators - The monitor shall have separate indicating segments for three separate alarm levels. The lights shall indicate when the preset limits the “Caution”, “Warning”, and/or “Alarm” set points have been exceeded. Optional strobes shall be provided to indicate warning and/or alarm conditions.

3.4Relay Outputs - The alarm set point drive signals shall activate user relays as specified in Paragraphs 3.4.1 through 3.4.4.

3.4.1Number of Relays - One relay for each set point level shall be provided for each of the three alarm levels. One relay shall be provided for fault conditions. A horn relay will be provided and will work in conjunction with alarm set points.

3.4.2Contact Rating - All alarm and fault relays shall be Form C, single pole, double throw. Contacts shall be rated for 5 amps resistive at 250 VAC or 30 VDC. The horn relay has form ‘A’ contacts and is always set as normally open and common.

3.4.3Contact Selections - The contacts shall be capable of being selected normally open or normally closed.

3.4.4Relay Configuration - The alarm relays shall be normally de-energized. The fault relay shall be normally energized.

3.5Malfunction Indication Alarm - The readout display described in Paragraph 3.1 shall display a separate unique character when an over range or under range condition exists, signal from the sensor is lost, there is a set point error or monitor memory failure.

3.6Audible Alarm - An audible piezo buzzer shall be provided when an alarm condition occurs. Provisions to replace buzzer with optional horn shall be available.

3.7Controls - Monitor controls shall be provided as specified in Paragraph 3.7.1 and 3.7.2.

3.7.1Operating Modes and Parameters Selection - The selections listed in this paragraph shall be accomplished by the use of switches, jumpers or remote control (not involving the use of tools).

a.display range value

b.latching or non-latching mode for the alarm set points

c.upscale or downscale acting alarms

3.7.2Front Panel Horn/Alarm Acknowledge Switch - This push button switch shall silence audible alarm indicators when alarm points are exceeded. Visual alarms will remain on as long as alarms are exceeded. This switch will reset latched alarms if normal gas conditions exist.

3.8System Power Requirements - The system shall operate on 115 or 220 VAC, 50 or 60 Hz. Power shall not exceed 40 Watts from its internal DC supply. An internal, push button, reset circuit breaker shall be provided.

3.9Maximum System Maintenance Requirements - The system shall require no periodic maintenance other than periodic checking of sensor response to a known concentration of gas.

3.10Approvals - As a minimum, the following parts of the system shall have approval by UL:

3.10.1All primary AC components including connectors

3.10.2All user relays

3.11Remote Sensor Option Parameters

3.11.1Operating Voltage - The sensor/transmitter can operate between 7-30 VDC.

3.11.2The monitor display will give an indication of when sensor is nearing the end of its useful life by means of the front panel display. This indication that the sensor is nearing its useful life will be based on the sensor output. It shall not be based on the time the sensor was in service.

3.11.3The monitor unit will be capable of storing and displaying average, minimum and maximum gas concentrations of the sensor over selected periods of time.

3.11.4Sensing elements of the sensor/transmitter will be mounted external to the main enclosure. All sensing elements can be replaced without opening main enclosure. No tools will be required for replacement of the toxic and oxygen sensing elements.

3.11.5Sensing Element Warranty - All sensing elements (sensors) will have a minimum useful life of one year. The supplier will provide replacement sensors at no charge for any sensor that does not meet the minimum requirement.

3.11.6The sensor/transmitter units can be located remote from the monitor unit by up to 50 feet via properly gauged wire.

3.11.7The sensor/transmitter units will have provisions for mounting to a wall or similar structure with an available bracket.

3.12Non-intrusive Calibration Capability

3.12.1All monitor/sensor systems can be calibrated without opening the sensor enclosure, and monitor unit functions are adjustable via the non-intrusive hand held wireless remote control.

3.12.2By means of a non-intrusive hand held wireless remote control unit, the monitor/sensor/transmitter will enter the calibration mode. The display of the monitor will instruct the user on when to apply zero and span gas. The system will automatically adjust its internal settings to the proper calibration values without further intervention by the user. Upon completion of a successful calibration, the system will exit the calibration mode. Date stamp of last successful calibration will be retained in the system internal memory, with capability to be displayed on display. If calibration is unsuccessful for any reason, the display must show an unsuccessful calibration attempt and revert to its previous calibration settings. Use of flashlight type devices, magnets or clamp-on devices to achieve calibration is not acceptable. The acceptable method uses a transmitter which employs a digitally encoded infrared light beam.

3.12.3There will be two types of non-intrusive hand held wireless remote control units available:

3.12.3.1A small non-intrusive hand held wireless remote control will let the user only perform sensor zeroing, calibration and setting the multiplex address (if applicable).

3.12.3.2A larger non-intrusive hand held wireless remote control will let the user not only do the functions of the small remote control but activate all functions and features of the system.

3.12.4The monitor infrared link will not be affected by low level ambient light either natural or man-made.

4.0Monitor Output Signal

4.14 to 20mA output signal (non-isolated) - Standard

4.1.1The signal from the monitoring instrument will be 4 to 20mA. The signal will be a sourcing type of signal capable of operating into a 600 ohm load.

4.24 to 20mA output signal (isolated) - Optional

4.2.1As an option, a fully isolated 4-20mA output signal shall be provided. The signal will be a sourcing type capable of operating into a 600 ohm load.

4.3Digital output signal - Optional

4.3.1The signal from the monitor will be a digital output type. All types must utilize a two wire connection. These wires are for the digital communication.

4.3.2The monitor will be capable of bi-direction communication, i.e. of sending and receiving digital signals. These digital signals will conform to FTT-10 based communication. The protocol is LonTalk supported by Lon Works. The speed of these digital signals will be no greater than 78.1 kb/s.

5.0Enclosure Mounting Style

5.1Monitor unit mounting

5.1.1The monitor shall provide 4 wall mount tabs for easy mounting.

5.1.2Installation, set up and start up of the monitor unit will be in such a manner that the enclosure need not be opened during this process.

5.1.3The gas sensor shall be capable of being mounted on the side or bottom of the monitor enclosure (except for combustible gases).

5.2Remote sensor mounting of the sensor/transmitter - If applicable

5.2.1The sensor portion of the monitoring system will be capable of being able to be remotely mounted from the electronics and display. The separate sensor enclosure will be able to be mounted up to fifty (50) feet from the main enclosure.

5.2.2The explosion-proof sensor housing option will be in an enclosure suitable for location in Class I, Division 1, Groups B, C & D classified areas. The general purpose housing option will be suitable for location in areas rated for NEMA 4X. All sensors for combustible gases shall be enclosed in the explosion-proof remote housing.

5.2.3For toxic and oxygen units, a cable supplied by the manufacturer will connect the sensor housing and the calibration electronics.

5.2.4Mounting strap for remote sensor

5.2.4.1A mounting strap shall be available to mount the sensor/transmitter to a wall or similar structure.

5.2.5Duct Mounted Remote Sensor/Transmitter

5.2.5.1There shall be a kit to mount the sensor/transmitter into a duct.

5.2.5.2The kit to mount the sensor/transmitter on a duct must provide calibration of the sensor/transmitter without the removing of the sensor from the duct.

5.2.5.3The duct mounted sensor/transmitter shall be able to monitor gas flow rates in a duct up to sixty (60) miles per hour.

6.0Gas Sampling System Options

6.1DC pump Gas Sampling option for the Gas Monitor System

6.1.1 The Gas Sampling system must be installed in the monitor enclosure.

6.1.2Signal - To eliminate radio frequency interference (RFI) and electromagnetic interference (EMI), the signal to the sensor from the Gas Sampling system will be in digital communication format.

6.1.3Operating Voltage - The Gas Sampling system will be able to operate on voltage from 7 up to 30 VDC at less than 5 Watts of power.

6.1.4The Gas Sampling system will have a flow sensor which will activate a relay when the gas sample falls below the acceptable flow rate to the gas sensor. There also will be an indication of the loss of gas flow on the front panel of the unit. A .6 Amps @ 110 Volts AC single pole, single throw relays will be provided for alarm indication.

6.1.5Introduction of the calibration gas to the gas sensor will be via an integral push button valve on the Gas Sampling system. This push button valve must return the Gas Sampling system to monitoring the sampled area when released.

6.1.6The Gas Sampling system will be able to pull a gas sample from up to 100 feet.

6.2Air aspirated pump Gas Sampling option for the Gas Monitor System

6.2.1The Gas Sampling system must be installed in the monitor enclosure.

6.2.2Signal - To eliminate radio frequency interference (RFI) and electromagnetic interference (EMI), the signal to the sensor from the Gas Sampling system shall be in digital format or frequency format.

6.2.3The Gas Sampling system will have an air aspirator pump to draw a gas sample to the gas sensor. It will be able to pull a gas sample from up to 100 feet.

6.2.4The Gas Sampling system will have a flow sensor which will activate a relay when the gas sample falls below the acceptable flow rate to the gas sensor. There also will be an indication of the loss of gas flow on the front panel of the unit. .6 Amps @ 110 Volts AC single pole, single throw relays will be provided for alarm indication.

6.2.5Introduction of the calibration gas to the gas sensor will be via an integral push button valve on the Gas Sampling system. This push button valve must return the Gas Sampling system to monitoring the sampled area when released.

6.3Airline monitor option for gas sampling - An option shall be provided to enable the measurement of a target gas from a compressed airline stream. The flow components shall be provided to facilitate connection to the airline along with pressure/flow regulation for proper gas sensing.